# columnNumber=2147483647
columnNumber=701
#26进制数
def convertToTitle(columnNumber):
    n=columnNumber
    s=""
    dict={1:'A',2:'B',3:'C',4:'D',5:'E',6:'F',7:'G',8:'H',9:'I',10:'J',11:'K',12:'L',13:'M',14:'N',
          15:'O',16:'P',17:'Q',18:'R',19:'S',20:'T',21:'U',22:'V',23:'W',24:'X',25:'Y',26:'Z'}
    while n!=0:
        n-=1
        index=int(n%26)
        s = dict[index+1] + s
        print("n:",n)
        n=int(n/26)
    print("n:",n)
    print(s)
convertToTitle(columnNumber)